CVE-2023-48311: Jupyter Dockerspawner

Medium severity, CVSS 4.3. EPSS: 0.6% chance of exploitation in the next 30 days.

dockerspawner is a tool to spawn JupyterHub single user servers in Docker containers. Users of JupyterHub deployments running DockerSpawner starting with 0.11.0 without specifying `DockerSpawner.allowed_images` configuration allow users to launch _any_ pullable docker image, instead of restricting to only the single configured image, as intended. This issue has been addressed in commit `3ba4b665b` which has been included in dockerspawner release version 13. Users are advised to upgrade. Users unable to upgrade should explicitly set `DockerSpawner.allowed_images` to a non-empty list containing only the default image will result in the intended default behavior.

Affected products

• Jupyter Dockerspawner: from 0.11.0, before 13.0 (fixed in 13.0)

Published 2023-12-08. Last modified 2026-06-17.